Ophthalmic mounting.



N. M. BAKER. OPHTHALMIC MOUNTING.

APPLICATION FILED APR. 28. 191i.

Patented Oct. 30, 1917.

l/Vl/E/VTUI? NELSON M. BAKE itasi r eaner, or se aaamea r ssaaansarr .assienQa e a eemen lenna or. MASSACHUSETTS- OPHTEA LMI MOUNT NG p eifieafien o was r rer-y aiea eaectse 19111.

Application filed April 28, 1917; Serial 165,115,

To all whom it may concern:

Be itknown that I, NELSON M. BAKER,

a citizen of the United States, residing at Southbridge, in the county of Worcester and State of Massachusetts, have invented certain new and usefullmprovements in Ophthalmic Mountings, of whichthe following is a specification.

This invention relates to improvements inophthalm-ic mountings and has particular referenceto the type of construction commonly known as a fingerpiece, in which the guards are carriedby pivotedspring actuated levers, which may preferably be manually operated to facilitate application or removal of the mounting from-the face. I

One oftheleadingobjects of the present.

invention is the provision of an improved construction forconnecting the lever to-the bridge or lens connecting member, which will eliminate the objectionable wear usually occurring atthis point of connection, and thus prevent undesirablewabbling or early breakage of the parts ofthe mounting.-

A further object of the invention is the provision ofan improved construction for this purpose in which the several parts shall be sofor'med as to be capable of ready construction and so related to each other as to facilitate to a maximum the assembling of. the several parts of the mounting in a neat and eflicient manner.

Another object of the present invention is the provisionof aconstruction which will accomplish the aforementioned objects and which in addition; will have the several parts so united onetothe other that they. will be located in their assembled position and accidental loosening or separation of the several partsreduced'to a minimum.

Other objects and advantages of my improved construction should be readily, ap-. parent. by reference to the following specification taken in connection with the accompanying drawings forming-a partthereof, andL itwill=be understood that I may make'any modifications in the specific details of construction shown and described within. the scope of; the appended claims without departing from; or exceedingthe spiritof my inventioni Figurel-representsa front elevation of a mounting-embodying my improvement.

Fig; 11 represents an enlarged vertical sectional; view illustrating theseveral parts 1n the process of being assembled.

Fig. 111', represents a. similar sectional.

view of: the several parts. in, assembled or, operative relation.

Fig. IV represents asectional view. of; a. slightly modified; construction. of bearing member;-

- Vrepresents asimilar view Of; another form ofmy construction.

Fig; VI, represents a sectionalview of a modified; manner; of locking the fastening device;

In the. drawings, in which similar char.- acters of reference are employedto denote corresponding partsthroughout, the several views, thennmeral l designates the bridge, of the mountingbeing, provided at each endwith the: clips2adaptedto receive the lenses. 3. and having formed intermediate thearched portion ofthe bridge and the lens engaging clips the flattened portions or pivot seats 4, onwhich the guard arms or levers. 51am; adapted to. turn.

In the typesof. mountings known prior to my, invention it has ordinarily been OHS: tomary to formin the lever 5 apivotre ceiving aperture, and to pass through said aperture some type of bearing member on which the lever may turn.

This constructiomhowever, has been open to serious objections, in that the lever would wear quite. rapidly and would then have a tendency to wabble androcl; on the pivot seat, interfering with the proper fit of themcunting on the face, while at the same time the wearing movement of the lever, against the pivot member wouldtendto loosen or unscrew the pivot.

I realize that certain, attempts to get away-from this difficulty have hitherto been made, and I have myself previously pro duced commercial constructions in which a longer. hearing has been secured by forminga tube or the like integralwith thelever and receiving the bearing member, This tube construction, however, while provid ing amore satisfactory bearing for the lever has not gotten away from the objectione iperienced', inthat the wear is moreor less directly. upon the pivot: member and has: a tendency. to tWiSt-i or loosen the pivot,

ltis, therefore, the purpose of-n y present invention to provide an impreveclree etrea tion which shall embody the several merits of my prior construction and in addition obviate the several dificulties experienced in connection therewith.

In the accomplishment of this result, in

that form of my construction particularly illustrated in Figs. H and Hi, I have shown the bridge seat a as providedwith the pierced aperture 6 extending therethrough and having fitting and suitably secured therein, as by soldering or any other suitable and desirable manner, the tube '7, whose length is slightly greater than the combined thickness of the bridge and of the lever and tube 8 carried thereby, so that the upper end of he tube 7 projects above the upper end of the tube or barrel 8 on the lever. lnteriorly the upper portion of the tube 7 is smooth or plain but is provided at its lower end with the inwardly extending threads 9 adapted to engage the threaded portion 10 of the pivot screw ll, having at its upper end the head 12 adapted to fit tightly against the upper end of the tube 7 and extend outwardly over the tube 8" and actuating spring 13 to secure the parts in position.

it will be noted by reference to Fig. II that the length of the screw 11 is such that the lower end can be spun over as at 1% in Fig. ill, so that the screw is securelylocked in position within the tube and held against any possible accidental loosening thereof, while being capable of ready removal with proper implements when desired.

The great advantages of this type of construction should be readily apparent and it will be seen for example when it is desired to assemble the mounting the spring 13 may be placed in position on the barrel 8 which is formed integral with or rigidly connected to the lover 5 and the entire parts readily slipped over the centering tube 7, the spring interlocking with the side of the strap to retain the spring under proper tension and the parts being held together in this position.

The lever having been applied overthe upper or free end of the bearing tube 7, it is then merely necessary to drop the securingscrew 11 into the tube, when it will slide through the plain portion of the tube and be properly guided and held thereby adjacent the threads, when a few turns of the screw will cause the threads to engage and draw the head of the screw down onto the bottom end of the tube to securely lock the several parts together. The parts being thus cone nected it is only necessary to spin over the lower end of the screw as at 14: to lock the screw against loosening.

Particular attention is invited to the facility of assembling my present mounting and particularly to the fact that when placingthe pivot screw in position in place of being necessary to work around and get it ina reai sion in position ordinarily, with my improvement it is merely necessary to apply the parts to the mounting and then to drop the screw into place when the tube or bearing member itself forms a guide and retaining device for holding the screw in proper h, n. L l I position, and it may be quickly and easily tightened, thus saving considerable time for the assembler and rendering a previously difficult and disagreeable operation a simple and easy one.

it will be understood that various modilications may be employed in the securing of the guide or b aring tube 7 in position in the aperture of the bridge, since it may have an exteriorly threaded portion 15 to engage with threads in the aperture of the bridge and screw down as against the shoulder 16, a notch 17 being provided in the upper end of the tube to receive a. screw-driver or the like and facilitate this assembling operation, as illustrated in Fig. 1V, or the tube may be inserted in the aperture as is the pivot screw later l y the spinning over of the lower end of the tube. as illustrated in Fig. V.

In Fig. VI, 1 have illustrated a further modification of my invention in which the under face otthebridge may be provided with a socket 18 to receive, or may have bearing directly against its under face without the formation of a receiving socket, the

lock nut member 19, which is adapted to be engaged on the lower end otthe fastening device 11 and to bear against the under side of the support to securely lock the fastening device in posit-ion and prevent accidental disengagement of the fastening device and thus of the parts held thereby.

In connection with the several embodiments of my invention herein described I would call particular attention to the neces sity in' a construction of this characternot only of providing maximum bearing to al low of easy movement of the parts without undue wear, but also the necessity of securingthe several parts in position and pre venting accidental loosening thereof.

In structures such. as shownin Fig. IV for example where the tube or pivot member 7 is threaded into the bridge, I preferably additionally lockit by spinning over the lower end while with the fastening device'll for retaining the parts I find it practically essential to the success of the invention the-tit be suitably locked in place. It is not a question merely of preventing separation and consequent loss of the parts, but

of at all times holding the parts against any wabbling or play tending to loosen them. For this reason it is feasible and practicable that the fastening device should have aloose fit in the upper portion of the tube which will serve merely as a guide for the position of the fastening device. It would be entirely possible to let the fastening device pass freely through the entire tube and be locked only by a nut or the like on the lower end by the slight modification of removing the threads shown at the lower end of the tube in Fig. VI, although I find the addition of these threads gives an additional factor of safety in this particular embodiment of my construction, and I wish to here call particular importance to the necessity of in some way locking the fastening device at its lower end to prevent accidental loosening thereof.

I claim:

1. In an ophthalmic mounting, the combination with a bridge having a pivot seat, of a tube secured within the bridge and rising theroabove, a lever having a barrel portion adapted to encircle the tube, an actuatiug spring for the lever carried by and surrounding the barrel and a fastening device having a head overlying the tube barrel and spring and engaging the tube, said fastening device having a threaded lower end interlocking with the tube for temporarily securing the parts together and having its lower end projecting below the bridge and tube and spun over thereagainst to permanently lock the parts in assembled relation.

2. In an ophthalmic mounting including a bridge, a pivot tube rising from the bridge, a lever mounted on the pivot tube and having a barrel encircling the tube, means for actuating the lever, and a fastening device having a head on its upper end limiting up ward movement of the lever and barrel por tion to the tube and having its lower end extending downward through the tube and bridge andprovided with an enlargement to prevent accidental loosening of the fastening device.

3. In an ophthalmic mounting, the combination with a bridge having a tube extending therethrough and projecting from one side thereof, of a lever turning on the bridge and having a barrel thereon encircling the tube, the upper portion of the tube being unthreaded and the lower portion thereof having inwardly extending threads and a headed fastening device having its head extending over the upper face of the tube and barrel, its lower portion in interlocking threaded engagement with the threaded interior of the tube and its lower end spun or enlarged and bearing against the under side of the tube or support to securely lock the fastening device in position.

i. In an ophthalmic mounting, the combination with a supporting member having an aperture therethrough, of a tube rising from the support at the aperture, a lever pivoted on the tube and having a barrel portion encircling the tube, a fastening device loosely inserted in the tube, and means for engaging the lower end of the fastening device to secure the lever in position on the tube.

5. In. a device of the character described, the combination with a support having an aperture therethrough, of a tube rising from the support at the aperture, a lever pivoted on'the tube and having a barrel portion oncircling the tube, an actuating spring forthe lever encircling the barrel portion, a headed fastening member loosely inserted in the tube, the span of the head being sufficient to prevent removal of the spring or barrel thereover, and means for engaging the lower end of the fastening device to retain the same in position.

6. In a device of the character described, the combination with a support, of a tube rising therefrom, the bore of the tube extending through the support, a lever having a barrel portion pivotally mounted on the tube, an actuating spring for the lever encircling the barrel portion thereof, a fastening device for the parts loosely fitting within the upper portion of the tube and of length to depend through and project below the support, and means on the lower end of the fastening device adapted to engage the under face of the support to lock the fastening device in position.

In testimony whereof I have afiixed my signature, in presence of two witnesses.

NELSON M. BAKER. Witnesses:

H. K. PARSONS, E. M. HAINORSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

